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SFM4300-50-O

Pressure-resistant flow sensor, air & O₂, 50slm, O-ring fittings

The mass flow meter SFM4300 features improved sensitivity and precision, even for low flow rates. The small, compact sensor is calibrated for air, O₂ and N₂O gases and – in contrast to its predecessor, the mass flow meter SFM4100 – it can also be used to monitor gas mixing. With a zero-point accuracy of 0.005 slm for a total range of up to 50 slm, the SFM4300 enables precise adjustment of the concentration in a wide selection of mixtures. The sensor unit has an I²C interface and produces a fully calibrated and temperature-compensated output signal. The mass flow sensor can be used for both medical and industrial gas mixing, fuel cells and for other OEM applications. In addition to inspiratory, expiratory and proximal flow measurement, Sensirion offers sensor solutions for gas mixing applications. These sensors are mainly used in anesthesia machines and are usually integrated into the overall machine. If we want to guarantee the patient’s safety while taking accurate, reproducible readings, we need the flow sensors in the machine to be stable and reliable – throughout the machine’s service life. Therefore, the Sensirion SFM4000 series is the ideal solution. It is is devided in two sensors: SFM4300 and SFM4200. The SFM4300 sensor can operate at pressures of up to 6 bar, store multiple gas calibrations and even perform self-testing while in use. Where safety and reliability are concerned, the SFM4300 is the preferred choice. The SFM4200 sensor is highly resistant to pressure, it guarantees reliable measurements at surges of up to 8 bar. Its signal processing time is 0.5 ms, making it incredibly fast and accurate. Customers also benefit from an expanded measurement range of up to 160 liters per Minute.

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Specification

Gas flow
Full scale flow rate0 - 50slm0 - 50slm
Typical accuracy±2.5% m.v.±2.5% m.v.
CalibrationAir, O₂ and mixtures thereofAir, O₂ and mixtures thereof
Sensor outputFlow and TFlow and T
Maximum operating pressure7bar7bar
Fluidic connector portsO-ringO-ring
Generic
Supply voltage3 - 5.5V3 - 5.5V
Max. supply current10000uA10000uA
InterfacesI²CI²C
Size (LxWxH)64.5 x 26 x 26.2mm64.5 x 26 x 26.2mm

Downloads

Datasheet SFM4300
  • 05/2022•
  • PDF•
  • 1.2 MB
DatasheetDownload Datasheet SFM430005/2022Download Datasheet SFM4300PDFDownload Datasheet SFM43001.2 MBDownload Datasheet SFM4300
Selection guide gas flow sensors
  • 12/2025•
  • PDF•
  • 563.3 KB
Application noteDownload Selection guide gas flow sensors12/2025Download Selection guide gas flow sensorsPDFDownload Selection guide gas flow sensors563.3 KBDownload Selection guide gas flow sensors
STEP file SFM4300
  • ZIP•
  • 6.8 MB
Drawings/CADDownload STEP file SFM4300Download STEP file SFM4300ZIPDownload STEP file SFM43006.8 MBDownload STEP file SFM4300
Reference and flow conversions
  • 09/2021•
  • PDF•
  • 293.7 KB
Application noteDownload Reference and flow conversions09/2021Download Reference and flow conversionsPDFDownload Reference and flow conversions293.7 KBDownload Reference and flow conversions
Reference and flow conversions calculator
  • XLSX•
  • 30.3 KB
Application noteDownload Reference and flow conversions calculatorDownload Reference and flow conversions calculatorXLSXDownload Reference and flow conversions calculator30.3 KBDownload Reference and flow conversions calculator
Engineering guide SFM
  • 01/2021•
  • PDF•
  • 592.1 KB
GuideDownload Engineering guide SFM01/2021Download Engineering guide SFMPDFDownload Engineering guide SFM592.1 KBDownload Engineering guide SFM
SEK-ControlCenter (all devices)
  • Link•
SoftwareDownload SEK-ControlCenter (all devices)Download SEK-ControlCenter (all devices)LinkDownload SEK-ControlCenter (all devices)Download SEK-ControlCenter (all devices)
Calibration certification gas flow sensors
  • 01/2023•
  • PDF•
  • 114.2 KB
CertificateDownload Calibration certification gas flow sensors01/2023Download Calibration certification gas flow sensorsPDFDownload Calibration certification gas flow sensors114.2 KBDownload Calibration certification gas flow sensors
REACH and RoHS declaration SFM/SGM
  • 04/2026•
  • PDF•
  • 104.6 KB
CertificateDownload REACH and RoHS declaration SFM/SGM04/2026Download REACH and RoHS declaration SFM/SGMPDFDownload REACH and RoHS declaration SFM/SGM104.6 KBDownload REACH and RoHS declaration SFM/SGM
Gas flow sensors brochure
  • 10/2025•
  • PDF•
  • 497.6 KB
FlyerDownload Gas flow sensors brochure10/2025Download Gas flow sensors brochurePDFDownload Gas flow sensors brochure497.6 KBDownload Gas flow sensors brochure
  • All products
  • •Gas flow sensors
  • •SFM4xxx

Sensor evaluation

Buy the following products to evaluate this sensor

NameDescriptionSeriesCategory
SEK-SFM4300-20-PGas flow sensors evaluation kit SFM4300SEK-SFMxxxxGas flow sensors

SEK-SFM4300-20-P

Gas flow sensors evaluation kit SFM4300

SEK-SFMxxxx

Gas flow sensors

Download the respective viewer software to start measuring

Go to download center

Start testing our sensors fast and easy with the evaluation kits

How to get started

Applications for this product

Mechanical ventilators

Precise and safe patient ventilation using ventilator flow sensors

Learn more

Anesthesia flow sensor

Unlock precise gas mixing at minimal flows with ultra-accurate anesthesia low flow sensors

Learn more

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